Ecco: The Tides of Time - Debug Menu

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Debug Menu:
When you have control of Ecco and can pause, Try to pause while Ecco is facing you. Once Ecco is facing you, press A, B, C, B, C, A, C, A, and B. If you entered the code correctly, a menu will pop up with all sorts of optionssuch as a sound test, level select, tempo, etc. This code can be entered as many times as you'd like, as long as the game is paused while Ecco is facing you.

Hard Mode:
In the starting area break the two shells above you, and then swim through the tunnel to start the game in hard mode.

Unlimited Air and Health:
Turn Ecco left or right and pause the game while Ecco is facing towards the screen. Press A, B, RIGHT, A, C, A, DOWN, A, B, RIGHT, A, and then unpause. You will now never die from lack of air or injuries.